Making an apparently common mistake when petitioning for judicial review of an electoral board decision that sustained objections to a proposed referendum on term-limits for Chicago’s mayor, the proponents of the reform initiative served their lawsuit on the board (the right move) and the attorney who represented the successful objectors — which was a major misstep under the Election Code, because Section 10-10.1 of the tricky statute says petitioners “must serve a copy of the petition upon the electoral …